In QCD the momentum and spin structure of the nucleon explored in hard-scattering reactions beyond the collinear approximation is described in terms of transverse momentum dependent parton distribution functions (TMD PDFs). The production of hadrons in the semi-inclusive deep inelastic scattering (SIDIS) of leptons off a nucleon,
\(\ell \mathrm {N} \rightarrow \ell ^\prime \mathrm {h X}\) 
is a standard tool to probe the TMD nucleon structure. The differential cross-section for an unpolarised nucleon in the one-photon exchange approximation [1]} can be written as
\(\frac{\mathrm {d} \sigma  \,}{\mathrm {d} x \,\mathrm {d} y \,\mathrm {d} z \,\mathrm {d} P_\mathrm {T}^2 \,\mathrm {d} \varphi _\mathrm {h} \,}= \sigma _0\left( 1 + \epsilon _1 A_\mathrm {UU}^{\cos \varphi _\mathrm {h}} \cos \varphi _\mathrm {h}+ \epsilon _2 A_\mathrm {UU}^{\cos 2\varphi _\mathrm {h}} \cos 2\varphi _\mathrm {h}+ \lambda \epsilon _3 A_\mathrm {LU}^{\sin \varphi _\mathrm {h}} \sin \varphi _\mathrm {h}\right),\\\mathrm {where}\quad \epsilon _1 = \frac{2(2-y)\sqrt{1-y}}{1+(1-y)^2},\qquad \epsilon _2 = \frac{2(1-y)}{1+(1-y)^2},\qquad \epsilon _3 = \frac{2y\sqrt{1-y}}{1+(1-y)^2}.\) 
